Legend of Zelda Conversation Loading Code

gistfile1.asm

The code that actually loads this is executed from $882B

LDA $045F
STA $0303
INC $045F
LDY $0415      ; $0415 apparently contains the conversation to be loaded
LDA $8000,Y
STA $00
INY
LDA $8000,Y
STA $01
LDY $0416      ; The character index to be loaded?
INC $0416
LDA ($00),Y    ; This actually loads the character
AND #$3F       ; Strips away the control bits
CMP #$25       ; $25 is *special*? WTF
BEQ 882B       ; Heh, effectively just skips drawing it; moves to the next char
STA $0305      ; storage for the character?
LDA #$10
STA $0604      ; no idea what this represents, except that the first few bytes of $060x are some kind of state which is regularly cleared
LDA ($00),Y    ; Load the full byte again
AND #$C0       ; Strip away everything *but* the control bits
BEQ $8879      ; If there aren't any control bits at all, skip to $8879
LDY #$02       ; Y here seems to maybe index the line to draw on?
CMP #$C0
BEQ $886A
DEY
CMP #$40
BEQ $886A
DEY
886A: LDA $8812,Y
STA $045F
CPY #$02